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Two things I don't like about frame less windows....
1. The windows can pop out at high rates of speed
2. They're much easier for a thief to break into as opposed to framed windows
Yep, less support for the window. Also I believe that wind noise is more, especially in a situation where the window isn't snug against the foam gasket (or whatever it was called) because of cold or binding or about four other reasons.
Newer cars where the window goes up into the roofline of the car do not have either of those problems, and they have less wind noise, as its the most aerodynamic method to have.
I like the frameless windows. Have them on a 2001 Subaru Forester, but noticed that Subaru changed that with later model years. Our 2007 Mini Cooper has frameless windows.
The one thing you need to be careful if you have the type that drops down and up when you open the door is if it is very cold and it freezes. I had that happen a few times.
Thanks for the laugh! I really needed that today. The doors on that 71 Monaco were about half the size of yer ZX. They were HUGE as was the glass. Park on an incline to the side of the car and you weren't getting out. The doors were heavy, heavy, heavy. As you can see from the pic the doors went from the kick panel to just passed the front of the rear seat cushion. Easy even for a big guy to get in and out of the back.
A lot of it is just style of the cars being built. But that said, there truly is safety design reasons too, such as side impact crashes and especially roll overs. A Sedan (aka framed window) is less likely to pop out in a side impact or rollover. This is considered "good" because it can help keep the passenger inside the vehicle if the glass is in place. These also make a quieter "cabin" for passengers without having to use expensive better seals. Also easier to prevent the window "pop out" at high speeds.
With a hardtop ( or aka frameless ) while they look better (in my opinion) at high speeds, yes, they can get sucked out at the top and break the glass. It scares the hell out of you the first time it happens, it sounds like a 60mm cannon going off next to your head. (I plead the fifth at this point. ). The other issues they look at in car building is safety again. With the hardtop, better seals have to be used to make the inside quiet enough for normal conversation volumes, but a side effect is a weaker mid section of the car in a side impact. It may not seem like much, but a framed door will take a min. 3-5 mph faster hit before the door caves into the passenger or driver. It truly is a big safety issue.
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). The other issues they look at in car building is safety again. With the hardtop, better seals have to be used to make the inside quiet enough for normal conversation volumes, but a side effect is a weaker mid section of the car in a side impact. It may not seem like much, but a framed door will take a min. 3-5 mph faster 
hit before the door caves into the passenger or driver. It truly is a big safety issue.
